Two-cycle engine



Nov. 16 1926. l 1,607,179

v H. C. STOLZ TWO-CYCLE ENGINE' Filed March 16 1925 @i INVENToR um* a swz.

ATTORNEY Y Patented Nov. l5, i926,

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Two-CYCLE Encina.'

Applicatonled March 16, 1925. SeraINo. 15,890;y

This invention has particular referenceto a two-cycle, internal combustion engine `of the three-port valveless type, such as are commonly used in'oil iield'operation and are i operated either on liquid fuel or natural gas. In this type of engine the engine fly wheel is initially rocked to build up a combustible charge inv the pump chamber Vand introduce it into the combustion chamber. In larger` engines, especially, this preliminary rocking, incidental to startling, is quite a task because of the resistance offered by the gases'compressed'ahead of the piston before-the pistonrcaches the intake ports to uncover them.' It is known in theart, to

arrange auxiliary gas andair intake portsr this typeV of gas engine by rocking have been invented but heretofore7 kin vcertain engines there has been but one auxiliary inlet provided in the cylinder for both gas and air,

to control the gas and air, which as a whole are but crude formsrof .mixing valves. Y Among theobjections to such known constructions is the dangerous amount of gas passing out through the auxiliary air intake to the atmosphere while starting the engine, and the blowing out of a part ofthe charge after engine is started and before the auxiliary cocks are closed.

The invention further resides in the salient features of construction, and the arrangements and combinations of parts described in detail in the following descrip- Vtion anddetined in a succinct manner inthe appended'claims reference being made to the accompanying drakvvingv wherein I Fig. 1 is a fragmentary longitudinal sectional view of the cylinder constructed in accordance with the present invention; l

I am'aware that various means of starting with more or less external-piping and valves Fig. 2 ispan elevation thereof.;

Fig. 3 fs a longitudinal section through the engine with the piston which is shown partly in elevation, at its full compression.;

F ig. l is a fragmentary longitudinal section depicting the piston at its full expansion; i

Fig. 5 is a Similar. view wherein the piston i is about to uncover ports; Figs. `@and 7 are respectively transverse sections on lines (3-6 and 7-7 fof Fig. 3;

Fig.` 8 is a diagrammatic View indicating the auxiliary intake the path ofthe engine crank shaft; and

' Fig. 9 is a detailed section illustrating means vfor completely closing the auxiliary intake ports.

` 'lhecyiinder 1 is provided with the piston 2, the skirt of which is designed to uncover the gas intake port 3 and an airintake port t upon each forward reciprocationto admit of a charge being admittediint'o the pump chamber 5 to be transferred subsequently through the'transfer 'port 6 to the combustion chamber 7, such transfer being effected by reason of the piston, on its rearward or Yreturn reciprocation, closing the ports 3 yand 4C andacting in the capacity of a pump vto compress the gaseous mixture'rin rsaid chamber 5 so thatuthe said mixture will readily escape into the combustion' chamber as the piston uncovers the transfer'port 6.' The exhaust gases escape from the'combustion chamber through the exhaust port 8. y

The foregoing is more Aor less common in two cycle engines` ofthe three-port type, and .in-rocking thefly wheel it hasbeen necessary Vv-to uncover the intake ports which operation required the piston to be moved against an excessiverhead pressure; quite. a taskl for man power. Recent kpatents disclose the useV of-auxihary yintake Vports which the piston y uncover prior to uncovering the main ports,

and which require a relatively small amount of man power. y y

My present inventionyis an improvement on my prior` Patent No. 1,203,807, dated November 7, 1918, andV comprises an auxiliary air intake port`9 andan auxiliary intake port 10 in each ofk which is secured an inwardly opening check valve 1,1. The check valves project outwardly and are housed within manifold-like chambers 12 and 13 for which I chambers also respectively leadthe gas inplitude which would closely approach position 0 required to uncover the main intake ports. After the engine has been started the major portion of the charge will beadmitted through the main intake ports although a portion of the charge will enter through the auxiliary ports. As the piston lbegins to compress its charge in chamber Y5 the check valves immediately close so as to prevent the escape of any portion of the charge through the auxiliary ports before the piston covers the same. l f

After the engine has been started both auxiliary valves are readily closed Yby manually adjustable valves 16' whichare threaded through a removable wall plate 17 for'adjustment toward and from the casing of the respective check valve for closing the inlet side thereof whereupon the auxiliary ports are rend-ered completely inoperative for normal running of the engine.

`What is claimed is n 1. ln a two-cycle engine of the three-port valveless type having air and gas intake ports covered and uncovered by the engine piston, a manifold chamber for each the air andy gas intake ports7 and an auxiliary intake port leading from each chamber into -the engine cylinder rearwardly of the lirst ports and adapted to be covered and uncovered by the piston. l n

' 2. In aV two-cycle engine of the three-port valveless type having air and gas intake ports covered and uncovered by the engine piston, a manifold chamber for each of the air and gas intake ports, an auxiliary intake y port leading from each chamber into the engine cylinder rearwardly of the first ports and adapted to be covered and uncover-ed by the piston, and inwardly opening check valves arranged in each auxiliary port.

3. ln a two-cycle engine of the three-port valveless type having air and gas intake ports covered and uncovered by the engine piston,

a manifold chamber for each the air andl gas intake ports7 an auxiliary intake port leading from each chamber into the engine cylinder rearwardly of the first ports and adapted to be covered and uncovered by the piston, inwardly opening check valves arranged in each auxiliary port, and manual means for rendering the auxiliary ports inoperative.

4. ln a two-cycle engine of the three-port valveless type having air Vand gas intake ports covered and uncovered by the engine piston, a manifold chamber for each the air and gas intake ports, an auxiliary intake port leading from each chamber into the engine cylinder rearwardly of the first ports and adapted to be covered and uncovered by the piston, inwardly opening check valves arranged in each auxiliary port, the `outer end of the casing of each check valve provid- A ing a valve seat, and a manual valve for engaging on said seat to close the valvepassage.

5. ln a two-cycle engine of the three-port n valveless type having. air and gas intake ports, anauxiliary intake port leading into the engine cylinder rearwardlyfrom each of the first ports, inwardly opening check valves arranged in each auxiliary port, and manual means for rendering the auxiliary ports inoperative.

6. ln a two-cycle engine of the three-port y valveless type having air' and gas intake ports, an auxiliary intake port leading into the engine cylinder rearwardly. of each of l the first ports, a check valve arranged in each auxiliary port, the outer end VVof ythe casing of each check valve providing a valve seat7 and ay manual valve for engaging on said seat to lclose the valve passage. Y

1n testimony whereof l affix my signature.

. HARRY C. STOLZ. 

